Backwards compatibility of files generated in performant restore, milestoned for v6.3

We are utilising the backup files generated by FDB for running some analysis on our database. This PR mentions that a new backup format will be put in place, milestoned for FDB v6.3. We would like to be able to continue using our analysis code to parse backup files with the old format, even as we upgrade our database to v6.3 and later, for the newest bells and whistles.
Would it be possible to generate backup files with the old backup format, circa v6.2.7, if our database is upgraded to v6.3 and later? Otherwise, with every upgrade, we would have to modify our analysis code to cater to a new format.